Evaluation Of Test Methods For Stiffness Properties Of Hot Mix Asphalt Hma

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Evaluation Of Test Methods For Stiffness Properties Of Hot Mix Asphalt Hma

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Author : Stephen Alan Cross
language : en
Publisher:
Release Date : 2004

Evaluation Of Test Methods For Stiffness Properties Of Hot Mix Asphalt Hma written by Stephen Alan Cross and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Pavements, Asphalt categories.

The current 1993 AASHTO "Design Guide for Design of Pavement Structures" uses resilient modulus to assign an "a" coefficient to hot mix asphalt (HMA) to determine the required thickness of the HMA layer for a given traffic loading and subgrade support condition. There are several methods to determine the modulus of a mix for use in determining the "a" coefficient. Modulus results are a function of the test method and curing conditions. Therefore, the test method and curing conditions would have an effect on the "a" coefficient used in thickness design and, hence, the thickness of the pavement layers. A need was voiced by the Kansas Department of Transportation (KDOT) to evaluate the available test methods for determination of the stiffness properties of HMA.

Laboratory Evaluation Of Hot Mix Asphalt Hma In Delaware

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Author : Prarthana Banerji
language : en
Publisher:
Release Date : 2007

Laboratory Evaluation Of Hot Mix Asphalt Hma In Delaware written by Prarthana Banerji and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

Pavement design approach is slowly moving towards the mechanistic design approach from the traditional pavement design. One of the drawbacks of traditional pavement design is that it does not take into consideration the effect of changing load types in the design. Hence the mechanistic design approach has an edge over the traditional pavement design in this aspect. The mechanistic design approach also helps in improved characterization and utilization of available materials, better prediction of performance, and improved definition of existing pavement layer properties as well as the accommodation of environmental and aging effects. The success of the mechanistic design approach is dependent on understanding the behavior of the material properties. Of all the material properties, resilient modulus is the most important of all because it helps in better characterization of the stress - strain relationship of the material. The advantages of resilient modulus is that it is: (1) used to define fundamental material properties, (2) used in constitutive models, (3) used to predict stress, strain, and displacement, (4) used to develop performance models, (5) used in the current American Association of State Highway and Transportation Officials (AASHTO) pavement design guide and (6) used in the mechanistic design approach. The focus of this research is to evaluate the resilient modulus of several mixtures from DelDOT. Hence the goal is to develop quantitative models of Resilient Modulus of Delaware Hot Mix Asphalt (HMA). This research will help to increase the understanding of the behavior of construction materials that are used in Delaware and also provide a database of resilient moduli for further analysis and refinement of pavement design and evaluation. The resilient modulus test carried out in this research uses aspects of AASHTO and American Society for Testing and Materials (ASTM) test methods for determining the resilient modulus of bituminous mixtures by indirect tension.

Evaluation Of Various Treatment Methods For Enhancing The Properties Of Recycled Concrete Aggregate For Hot Mix Asphalt

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Author : Hanaa Al-Bayati
language : en
Publisher:
Release Date : 2019

Evaluation Of Various Treatment Methods For Enhancing The Properties Of Recycled Concrete Aggregate For Hot Mix Asphalt written by Hanaa Al-Bayati and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.

The application of treated CRCA with heat treatment and short mechanical treatment leads to an increase in the rutting resistance, a decrease in the total rut depth, a slight increase in the stiffness modulus, and an increase in the rutting factor of asphalt mixtures depending on the type of CRCA. The application of treated CRCA with the pre-soaking method and short mechanical treatment results in an increase in the stiffness and rutting factor of mixtures, depending on the type of CRCA. The findings demonstrated that the mixtures that included untreated CRCA have much higher ITS values than the control mix, registering a significant increase of 68%, 70%, 85.6% and 86.7%, for the mixtures that included 30% untreated CRCA#1 and CRCA#2 in both unconditioned and conditioned samples, respectively. This is followed by the ITS values of the mixtures that included 60% untreated CRCA#1 and CRCA#2 for both unconditioned and conditioned samples with an increase of 41.4%, 49.0%, 71.5%, and 56.8%, respectively. Additionally, a reasonable improvement in the ITS values in both conditioned and unconditioned samples were recorded for the mixtures that included 30% treated CRCA with different treatment techniques compared to the mixture that included 30% untreated CRCA. Furthermore, all tensile strength ratio (TSR) values for mixtures that included untreated CRCA with different types and percentages are higher than the minimum required value of MTO specifications. This indicates a successful application for CRCA in these mixtures. The use of the combination technique of pre-soaking method with weak acid followed by a short mechanical treatment method was a highly successful method for enhancing moisture resistance of asphalt mixtures as compared to other combination methods. From TSRST test, the findings indicated that the fracture temperature is reduced due to the CRCA addition compared to the control mix. However, there is no significant influence for the RCA type on the thermal cracks at low temperatures. Additionally, the fracture stress of the mixtures that included different untreated CRCA types with various proportions is generally higher than the fracture stress of the control mix Furthermore, the application of the combination of various treatments leads to a significant reduction in the fracture temperature, indicating a successful application of treated CRCA in HMA mixtures in cold regions. However, the combination of heat at 300 °C and short mechanical treatment has a considerable impact on the fracture temperature of asphalt mixtures as compared to other combination techniques. The results of ANOVA statistical analysis showed that the type of CRCA had a significant effect on the stiffness and rutting, ITS, and the fracture temperature of asphalt mixtures. Additionally, the type of treatment method had a considerable effect on the stiffness, rutting, and fracture temperature of HMA mixtures. In contrast, both the type of treatment method and the type of CRCA have an insignificant effect on the fracture stress of asphalt mixtures. The results of cost analysis revealed that both heat and pre-soaking treatment is quite reasonable, referring to many economic benefits and indicating that these treatment methods could be applicable. In conclusion, the results of this study indicate that the application of different CRCA types in various forms: treated and untreated is very successful and can contribute greatly towards more RCA applications in the asphalt pavements.

Superpave Mix Design

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Author : Asphalt Institute
language : en
Publisher:
Release Date : 2001-01-01

Superpave Mix Design written by Asphalt Institute and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-01-01 with Asphalt categories.

Bituminous Mixtures And Pavements Vii

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Author : A.F. Nikolaides
language : en
Publisher: CRC Press
Release Date : 2019-05-24

Bituminous Mixtures And Pavements Vii written by A.F. Nikolaides and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-24 with Technology & Engineering categories.

Highway engineers are facing the challenge not only to design and construct sustainable and safe pavements properly and economically. This implies a thorough understanding of materials behaviour, their appropriate use in the continuously changing environment, and implementation of constantly improved technologies and methodologies. Bituminous Mixtures and Pavements VII contains more than 100 contributions that were presented at the 7th International Conference ‘Bituminous Mixtures and Pavements’ (7ICONFBMP, Thessaloniki, Greece 12-14 June 2019). The papers cover a wide range of topics: - Bituminous binders - Aggregates, unbound layers and subgrade - Bituminous mixtures (Hot, Warm and Cold) - Pavements (Design, Construction, Maintenance, Sustainability, Energy and environment consideration) - Pavement management - Pavement recycling - Geosynthetics - Pavement assessment, surface characteristics and safety - Posters Bituminous Mixtures and Pavements VII reflects recent advances in highway materials technology and pavement engineering, and will be of interest to academics and professionals interested or involved in these areas.

Laboratory Tests For Hot Mix Asphalt Characterization In Virginia

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Author :
language : en
Publisher:
Release Date : 2005

Laboratory Tests For Hot Mix Asphalt Characterization In Virginia written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Asphalt categories.

This project reviewed existing laboratory methods for accurately describing the constitutive behavior of the mixes used in the Commonwealth of Virginia. Indirect tensile (IDT) strength, resilient modulus, static creep in the IDT and uniaxial modes, flexural beam fatigue, and dynamic modulus tests were conducted on two typical mixes used in Virginia: SM-9.5A (surface mix) and BM-25.0 (base mix). The tests conducted produced a wealth of data on typical values for the properties of the two mixes studied over a wide range of temperatures and loading frequencies. The results suggest that the IDT strength test is an effective test to characterize the tensile strength of hot-mix asphalt (HMA), especially for thermal cracking evaluation. The resilient modulus test and the static creep test in the IDT setup are practical and simple to perform, but the analysis of the measurements is complicated, and the variability of the results is high. The compressive uniaxial dynamic modulus and the uniaxial static creep tests were found to be simple to conduct and to analyze because of the homogeneous state of stress in the specimen during testing. The flexural fatigue test was time consuming, but the test produces valuable information about the fatigue properties of hot-mix asphalt. The investigation also found good correlations among the IDT strength, resilient modulus, and dynamic modulus results. A variety of tests is recommended for characterizing the mechanistic-empirical pavement analysis and design. These tests would provide the properties needed to characterize the asphalt layers for the pavement analysis and design. The recommended tests are as follows: IDT strength for characterizing HMA susceptibility to thermal cracking, dynamic modulus for characterization of the constitutive behavior of the HMA, uniaxial creep for characterizing permanent deformation characteristics, and flexural fatigue tests to characterize fatigue properties. Materials characterization testing can be a valuable tool in pavement design. The use of mechanistic-empirical modeling can be used to predict the performance of a pavement. With this type of testing and modeling, the materials used in pavements will be of better quality and more resistant to environmental and structural deterioration. A more durable pavement will aid in reducing the frequency and costs associated with maintenance.

Evaluation Of A Hot Mix Asphalt Perpetual Pavement

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Author :
language : en
Publisher:
Release Date : 2010

Evaluation Of A Hot Mix Asphalt Perpetual Pavement written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Pavements, Asphalt categories.

Improved Mix Design Evaluation And Materials Management Practices For Hot Mix Asphalt With High Reclaimed Asphalt Pavement Content

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Author : Randy Clark West
language : en
Publisher: Transportation Research Board
Release Date : 2013

Improved Mix Design Evaluation And Materials Management Practices For Hot Mix Asphalt With High Reclaimed Asphalt Pavement Content written by Randy Clark West and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Pavements, Asphalt categories.

TRB's National Cooperative Highway Research Program (NCHRP) Report 752: Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content describes proposed revisions to the American Association of State Highway and Transportation Officials (AASHTO) R 35, Superpave Volumetric Design for Hot Mix Asphalt, and AASHTO M 323, Superpave Volumetric Mix Design, to accommodate the design of asphalt mixtures with high reclaimed asphalt pavement contents.

Evaluation Of Laboratory Conditioning Protocols For Warm Mix Asphalt

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Author : Fan Yin
language : en
Publisher:
Release Date : 2013

Evaluation Of Laboratory Conditioning Protocols For Warm Mix Asphalt written by Fan Yin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Warm-Mix Asphalt (WMA) refers to the asphalt concrete paving material produced and placed at temperatures approximately 50°F lower than those used for Hot-Mix Asphalt (HMA). Economic, environmental and engineering benefits have boosted the use of WMA technology across the world during the past decade. While WMA technology has been successfully utilized as a paving material, several specifications and mix design protocols remain under development. For example, currently, there is no consistent laboratory conditioning procedure for preparing WMA specimens for performance tests, despite being essential for mix performance. Based on previous studies, several candidate conditioning protocols for WMA Laboratory Mixed Laboratory Compacted (LMLC) and off-site Plant Mixed Laboratory Compacted (PMLC) specimens were selected, and their effects on mixture properties were evaluated. Mixture stiffness evaluated in a dry condition using the Resilient Modulus (MR) test (ASTM D-7369) was the main parameter used to select a conditioning protocol to simulate pavement stiffness in its early life. The number of Superpave Gyratory Compactor (SGC) gyrations to get 7±0.5% air voids (AV) was the alternative parameter. Extracted binder stiffness and aggregate orientation of field cores and on-site PMLC specimens were evaluated using the Dynamic Shear Rheometer (DSR) (AASHTO T315) and image analysis techniques, respectively. In addition, mixture stiffness in a wet condition was evaluated using the Hamburg Wheel-Track Test (HWTT) (AASHTO T324) stripping inflection point (SIP) and rutting depth at a certain number of passes. Several conclusions are made based on test results. LMLC specimens conditioned for 2 hours at 240°F (116°C) for WMA and 275°F (135°C) for HMA had similar stiffnesses as cores collected during the early life of field pavements. For off-site PMLC specimens, different conditioning protocols are recommended to simulate stiffnesses of on-site PMLC specimens: reheat to 240°F (116°C) for WMA with additives and reheat to 275°F (135°C) for HMA and foamed WMA. Additionally, binder stiffness, aggregate orientation, and overall AV had significant effects on mixture stiffness. Mixture stiffness results for PMFC cores and on-site PMLC specimens in a wet condition as indicated by HWTT agree with those in a dry condition in MR testing. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148143

Evaluation Of Indirect Tensile Test Idt Procedures For Low Temperature Performance Of Hot Mix Asphalt

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Author : Donald W. Christensen
language : en
Publisher: Transportation Research Board
Release Date : 2004

Evaluation Of Indirect Tensile Test Idt Procedures For Low Temperature Performance Of Hot Mix Asphalt written by Donald W. Christensen and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Pavements, Asphalt categories.

Introduction and Research Approach -- Findings -- Interpretation, Appraisal, and Applications -- Conclusions and Recommendations -- References -- Appendixes.